Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 20 for “"sperm concentration"”.
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Testicular cancer; gonadal, sexual and psychological aspects of the disease and its treatment.
… and androgen receptor (AR) polymorphisms on sperm concentration was investigated. Radiotherapy (RT) or 3 to 4 cycles of chemotherapy (SCT) caused initial decline in sperm concentration, which returned to pre-treatment levels 2 to 5 years after therapy. In the SCT group, sperm concentration 1 …
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A retrospective analysis of semen samples and reproductive hormones in Africa and the middle east
… Basic semen parameters such as semen volume, sperm concentration, total sperm count, progressive motility, total progressively motile count, sperm morphology, total normal sperm count, and functional sperm count such as DNA fragmentation, sperm viability and oxidation-reduction potential (ORP) …
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Components of fractionated stallion seminal plasma and the effects of seminal plasma on sperm longevity
… s ejaculate is a series of jets that differ in sperm concentration, semen volume and biochemical composition. Before the actual ejaculation, a clear and watery pre-sperm fluid is secreted. The first three jets form the sperm-rich fractions, and contain ¾ of the total number of sperm. The semen …
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Effects of Quaternary Ammonium Disinfectants on Mouse Reproductive Function
… were reduced. Males exhibited declines in both sperm concentration and motility. Male reproductive toxicity was further assessed in a series of in-vitro and in-vivo experiments. ADBAC+DDAC were cytotoxic to testicular Sertoli cells in culture at concentrations greater than or equal to 0.0005%. …
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The impact of genetic, environmental and life-style factors on male reproductive function
Recent studies have indicated a decline in sperm number in the western world during the past 50 years, sperm concentration changing from 113 to 66 millions per mL. Furthermore, significant geographical differences in male reproductive function have been observed. In Finland, the sperm concentration …
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Enhancing Boar Reproductive Performance for Purposes of Artificial Insemination
… boars for semen collection and increased spermatozoal output, and 2) determine the effects of dietary L-carnitine supplementation on boar libido, semen quality, sperm production, and maintenance of sperm motility during liquid storage. Experiment 1 utilized lean-type, terminal-line boars …
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Maturation, spawning and fertility of hybrid striped bass (Morone chrysops x Morone saxatilis) exposed to 6- and 9-month photothermal cycles
… on semen quality was determined by measuring concentration, motility, osmolality, pH and sugars of milt. Male and female effects on fertility variation were measured by crossing all males and females. Sperm concentration was estimated by spermatocrit, ultraviolet and fluorometric absorbance. …
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The characterisation of semen from Zulu Rams raised under extensive management conditions in KwaZulu-Natal
… based on the viability of Zulu ram semen. Spermiogramic parameters used to assess quality were: scrotal circumference (cm); semen volume (ml); semen pH; sperm concentration (x109), progressive and mass motility (%), and percentages of live and abnormal spermatozoa. Semen samples were …
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Obesity-Induced Alterations in Sperm Quality, Testicular Morphology, and Extracellular Vesicle Localisation in Male Mice
… with decreased testosterone levels, impaired spermatogenesis and reduced sperm function. Extracellular vesicles (EVs), which facilitate cell-to-cell communication, have been discovered in various biological fluids. Specifically, in the male reproductive system, testicular-derived EVs have been …
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The effect of ACTH and progesterone on semen characteristics, blood hormones and testicular histology in the bull
… experiments were designed to hormonally induce spermatozoal abnormalities in the ejaculate specifically, those abnormalities associated with the cytoplasmic droplet syndrome. The endocrine response during and following hormone administration was monitored to determine if there was an association …
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Immunological castration of boars temporarily reduces testosterone concentration, testis size and function, without long term effects on libido and sperm quality
… and serum harvested to evaluate testosterone concentrations via RIA. At wk 25, 18 pigs (n = 6/ group) were sacrificed and testes were removed, weighed, and measured. Libido was assessed at 32, 36, 47, 60, and 63+ wk of age (1 to 5; 1 = no libido; 5 = high libido) and semen collected beyond 60 …
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AVALIAÇÃO ANDROLÓGICA E ULTRASSONOGRAFIA DOPPLER EM GARANHÕES QUARTO DE MILHA
… correlation between testicular hemodynamics and sperm quality, emphasizing sperm motility. Six stallions of a quarter of a mile, healthy, were used in different reproductive conditions, located in the state of Paraíba. In the ultrasound evaluation Doppler mode, the indexes of pulsatility (PI) and …
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Novel method of selecting human spermatozoa for <em>In </em><em>Vitro </em>fertilization
… is based on semen analysis when semen volume, sperm concentration, motility and morphology are evaluated. These characteristics help to assess how many spermatozoa are capable to get through the natural barriers of the female reproductive tract such as viscous cervical mucus, the uterus and …
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Investigating the effect of phosphodiesterase inhibitors on human sperm motility and function
… male infertility. This may include problems with sperm concentration, motility and/or morphology. Sperm motility defects are associated with most cases of male infertility and provide problems for sperm reaching, binding to and penetrating the oocyte therefore impacting on fertilisation success. …
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Melatonin and seasonal cycles in muskoxen
… Radioimmunoassays were used to measure serum concentrations of gonadotrophins, gonadal steroids, prolactin and melatonin. Informal observations of dominance and breeding behaviour of males were recorded, semen was collected and assessed for gross motility, sperm concentration and …
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Anabolic-androgenic steroids : a series of meta-analyses
… treatment effects of AASs were observed for sperm concentration, testicle size, follicle-stimulating hormone, and luteinizing hormone. Moderate positive treatment effects were observed for lean body mass, thigh circumference, bench press, and squat; while moderate negative effects were found …
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Choline Acetyltransferase and Carnitine Acetyltransferase Activity in Human Spermatozoa During Capacitation
… regional distribution of ChAT activity in human spermatozoa is altered during in vitro capacitation and it correlates with the fertilizing potential of sperm.</p> <p>Regional immunoreactivity in human spermatozoa as assessed by fluorescent immunocytochemistry was compared with ChAT and CaAT …
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Studies on genetic aberrations as possible predictors of the outcome of assisted reproduction
… the World Health Organization (WHO) in regard to sperm concentration, motility and morphology are, however, poor predictors of fertility. In about half of the involuntarily childless couples the causes are solely or partly male related. In 60-75% of cases the aetiology of reduced semen quality …
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Marine invertebrate sperm: assessment of sperm quality using computer-aided sperm analysis
… midae (Gastropoda) were investigated. The sperm morphology and base-line data were gathered concerning the sperm concentration, motility and sperm kinematic parameters using computer-aided-sperm analysis (CASA). Sperm morphology and sperm motility play an important role in determining sperm …
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New methods for cryopreserving rooster spermatozoa
Rooster spermatozoa sustain permanent membrane damage during cooling, thawing and dilution due to inappropriate changes during the phase transition and osmotic intolerance. Glycerol is a common cryoprotectant used to protect cells during freezing, but its relatively large molecular weight and …